Replacement of the Filter Assy in Valve Block of the THS Actuator

TASK 27-44-51-960-001-A
Replacement of the Filter Assy in Valve Block of the THS Actuator

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND THE RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR CAN CAUSE DAMAGE TO THE EQUIPMENT.

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

ZONE: 310

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE
No specific	1	CONTAINER 3 L(3/4 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)
No specific	Torque wrench: range to between 2.3 and 2.1 m.daN (16.96 and 15.49 lbf.ft )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03LDA1)	Grease-Hydraulic Systems - -
(Material No.08BBB1)	Non Aqueous Cleaner-- Petroleum Based -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
312AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
2	PACKING	AIPC 27-44-55-01-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 27-41-00-720-001-A	Functional Test of the THS-Actuator Overtravel Related to the Mechanical Indicator
TASK 27-44-51-210-004-A	Check Oil Level of THS Actuator Gearbox
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 29-00-00-910-002-A	Safety Procedures of the Hydraulic System
TASK 29-14-00-614-001-A	Depressurization of the Hydraulic Reservoirs
Replacement of the Filter

3. Job Set-up
Subtask 27-44-51-010-065-A

A. Get Access
(1) Put the ACCESS PLATFORM 6M (20 FT) - ADJUSTABLE in position.
(2) Open the access door 312AR.

Subtask 27-44-51-860-065-A

B. Aircraft Maintenance Configuration

WARNING: OBEY THE HYDRAULIC SAFETY PROCEDURES.

(1) Obey the hydraulic safety procedures (Ref. AMM TASK 29-00-00-910-002)

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(2) Depressurize the Green and Yellow hydraulic systems and put them in the maintenance configuration (Ref. AMM TASK 29-00-00-864-001).
(3) Make sure that the Blue hydraulic system is depressurized and put it in the maintenance configuration.
(Ref. AMM TASK 29-00-00-864-001).
(4) Depressurize the reservoirs of the Green and Yellow hydraulic systems.
(Ref. AMM TASK 29-14-00-614-001).
(5) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the Green, the Yellow and the Blue hydraulic systems:

In the cockpit on the hydraulic section 40VU of the overhead panel
On the ground service panels of the Green, the Yellow and the Blue hydraulic systems.

Subtask 27-44-51-865-063-A

C. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

4. Procedure
Subtask 27-44-51-020-054-A

A. Removal of the Filter
(1) Put a CONTAINER 3 L(3/4 USGAL) under the filter assembly (1).
(2) Remove the filter (3) from the filter assembly (1).
(3) Remove and discard the packing (2).

Subtask 27-44-51-560-051-A

B. Preparation for Installation
(1) Clean the filter with the Non Aqueous Cleaner-- Petroleum Based - (Material No.08BBB1) and a Textile-Lint free Cotton - (Material No.14SBA1) .
(2) Do a visual inspection of the filter (3).
(3) Apply the Grease-Hydraulic Systems - - (Material No.03LDA1) to the new AIPC 27-44-55-01-020 PACKING (2).
(4) Install the packing (2) on the filter (3).

Subtask 27-44-51-420-054-A

C. Installation of the Filter at the Valve Block
(1) Put the filter (3) with the packing (2) in position.
(2) Install the filter (3) and the packing (2) in the filter assembly (1).
(3) TORQUE the filter (3) to between 2.3 and 2.1 m.daN (16.96 and 15.49 lbf.ft )

.
(4) Remove the CONTAINER 3 L(3/4 USGAL).

Subtask 27-44-51-865-064-A

D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B11
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B09
** ON A/C NOT FOR ALL
49VU	FLIGHT CONTROLS/ELAC1/NORM/SPLY	15CE1	B06
49VU	FLIGHT CONTROLS/THS/ACTR/MOT2	19CE2	B04
** ON A/C ALL
105VU	FLT CTL/ELAC1/STBY SPLY	16CE1	A01
121VU	FLIGHT CONTROLS/THS ACTR/MOT3	19CE3	Q17
121VU	FLIGHT CONTROLS/THS ACTR/MOT1	19CE1	Q16

Subtask 27-44-51-720-051-A

E. Test
(1) Make sure that the THS actuator has the correct quantity of oil and fill as necessary (Ref. AMM TASK 27-44-51-210-004).
(2) Do a system test of the THS control (Ref. AMM TASK 27-41-00-720-001).

WARNING: MAKE SURE THAT THE TRAVEL RANGES OF THE FLIGHT CONTROLS SURFACES ARE CLEAR. MOVEMENT OF FLIGHT CONTROLS CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(3) Do a visual check of the THS actuator and make sure that there is no leakage from:

The hydraulic connections
The oil filler-plug connection
The oil drain-plug connection
The body of the THS actuator.

5. Close-up
Subtask 27-44-51-410-064-A

A. Close Access
(1) Remove the warning notices.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the access door 312AR.
(4) Remove the access platform.

[Rev.10 from 2021] 2026.03.31 23:51:18 UTC